What this MCB is and what it carries
The 5SY4216-5: Rated for overvoltage category III and pollution degree 3, it mounts in any position and occupies 2 modular width units (36 mm) on a DIN rail. Depth is 76 mm; height 90 mm. The breaker carries sealable terminals and accepts comb busbars via combined top and bottom terminals. Halogen-free and silicon-free construction suits environments where outgassing matters.
Derating and ambient limits
The 16 A rating holds at 35 °C ambient. Above that, derate per the listed values from 40 °C to 60 °C. Operating range spans -40 °C to 75 °C, with relative humidity limits of 95% up to 55 °C stepping down to 35% at 75 °C.